-4(1+3x)=100

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Solution for -4(1+3x)=100 equation: 


Simplifying
-4(1 + 3x) = 100
(1 * -4 + 3x * -4) = 100
(-4 + -12x) = 100

Solving
-4 + -12x = 100

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '4' to each side of the equation.
-4 + 4 + -12x = 100 + 4

Combine like terms: -4 + 4 = 0
0 + -12x = 100 + 4
-12x = 100 + 4

Combine like terms: 100 + 4 = 104
-12x = 104

Divide each side by '-12'.
x = -8.666666667

Simplifying
x = -8.666666667

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